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From Yanbo Liang <yblia...@gmail.com>
Subject Re: FSImage from uncompress to compress change
Date Tue, 16 Jun 2015 10:54:25 GMT
As far as I know, HDFS get image compression information from image file
when loading fsimage.
So you can correctly load fsimage file even you set different compression
I strongly recommend to do these operations with the same version and run
"hdfs dfsadmin -saveNamespace" to save the new compacted fsimage to
decrease storage size.

2015-06-16 16:28 GMT+08:00 Xiaoyu Wang <wangxiaoyu1@jd.com>:

>  Hi all!
> My hadoop version is 2.0.0
> In my hadoop configuration config the dfs.image.compress=false
> Now the cluster has been running for a long time.
> the fsimage size is growing. I want to compress the fsimage.
> can I change the dfs.image.compress=true and
> dfs.image.compression.codec=xx.Codec and restart the namenode?
> the no compress fsimage can be read? the data will lost or not ?
> Thanks!

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